I think Syncthing is an under-appreciated tool! I wrote more about it at https://changelog.complete.org/archives/10219-a-simple-delay-tolerant-offline-capable-

I think Syncthing is an under-appreciated tool! I wrote more about it at https://changelog.complete.org/archives/10219-a-simple-delay-tolerant-offline-capable-mesh-network-with-syncthing-optional-nncp https://changelog.complete.org/archives/10219-a-simple-delay... https://www.complete.org/parallel-processing-of-filespooler-queues/ https://www.complete.org/parallel-processing-of-filespooler-... discusses parallel processing in Filespooler. This isn't a design goal and may not be the best fit, but when everything's just a file, some tricks are possible here. Another interesting use case is one-to-many and many-to-many; https://www.complete.org/filespooler/ https://www.complete.org/filespooler/ describes those.